Across
- 4. Carries oxygen to the body
- 5. The system that sends electrical signals throughout the body
- 7. The system that helps you breathe
- 9. System responsible for the production of hormones
- 11. The system that filters and removes waste from the blood
- 13. This system includes muscles
Down
- 1. This system moves nutrients and waste through the body
- 2. System that defends the body against infection
- 3. System involved in the digestion of food
- 6. Protects the body from external damage
- 8. Includes bones and joints
- 10. The "control center" of the body
- 12. Contains the brain and spinal cord